Re: [PATCH 5/5] drm/i915: Enable lspcon initialization

["Sharma, Shashank" <shashank.sharma@xxxxxxxxx>]

Regards
Shashank

On 5/31/2016 10:04 PM, Ville Syrjälä wrote:
> On Tue, May 31, 2016 at 02:55:46PM +0530, Shashank Sharma wrote:
> > This patch adds initialization code for lspcon.
> > What we are doing here is:
> > 	- Check if lspcon is configured in VBT for this port
> > 	- If lspcon is configured, configure it as DP port
> > 	- Register additional HDMI functions to support LS
> > 	  mode functionalities.
> >
> > Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
> > ---
> >   drivers/gpu/drm/i915/intel_ddi.c  | 36 ++++++++++++++++++++++++++++++++++--
> >   drivers/gpu/drm/i915/intel_drv.h  |  4 ++++
> >   drivers/gpu/drm/i915/intel_hdmi.c | 17 +++++++++++++++++
> >   3 files changed, 55 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> > index 811c829..2107c0d 100644
> > --- a/drivers/gpu/drm/i915/intel_ddi.c
> > +++ b/drivers/gpu/drm/i915/intel_ddi.c
> > @@ -2314,8 +2314,9 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
> >   	struct drm_i915_private *dev_priv = dev->dev_private;
> >   	struct intel_digital_port *intel_dig_port;
> >   	struct intel_encoder *intel_encoder;
> > +	struct intel_connector *intel_connector = NULL;
> >   	struct drm_encoder *encoder;
> > -	bool init_hdmi, init_dp;
> > +	bool init_hdmi, init_dp, init_lspcon = false;
> >   	int max_lanes;
> >
> >   	if (I915_READ(DDI_BUF_CTL(PORT_A)) & DDI_A_4_LANES) {
> > @@ -2347,6 +2348,19 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
> >   	init_hdmi = (dev_priv->vbt.ddi_port_info[port].supports_dvi ||
> >   		     dev_priv->vbt.ddi_port_info[port].supports_hdmi);
> >   	init_dp = dev_priv->vbt.ddi_port_info[port].supports_dp;
> > +
> > +	if (intel_bios_is_lspcon_present(dev_priv, port)) {
> > +		/*
> > +		* Lspcon device needs to be driven with DP connector
> > +		* with special detection sequence. So make sure DP
> > +		* is initialized before lspcon.
> > +		*/
> > +		init_dp = true;
> > +		init_lspcon = true;
> > +		init_hdmi = false;
> > +		DRM_DEBUG_KMS("VBT says port %c has lspcon\n", port_name(port));
> > +	}
> > +
> >   	if (!init_dp && !init_hdmi) {
> >   		DRM_DEBUG_KMS("VBT says port %c is not DVI/HDMI/DP compatible, respect it\n",
> >   			      port_name(port));
> > @@ -2399,7 +2413,8 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
> >   	intel_encoder->cloneable = 0;
> >
> >   	if (init_dp) {
> > -		if (!intel_ddi_init_dp_connector(intel_dig_port))
> > +		intel_connector = intel_ddi_init_dp_connector(intel_dig_port);
> > +		if (!intel_connector)
> >   			goto err;
> >
> >   		intel_dig_port->hpd_pulse = intel_dp_hpd_pulse;
> > @@ -2420,6 +2435,23 @@ void intel_ddi_init(struct drm_device *dev, enum port port)
> >   			goto err;
> >   	}
> >
> > +	if (init_lspcon) {
> > +		if (lspcon_init(intel_dig_port)) {
> > +			if (intel_hdmi_init_minimum(intel_dig_port,
> > +				intel_connector)) {
> > +				DRM_ERROR("HDMI init for LSPCON failed\n");
> > +				goto err;
> > +			}
> > +		} else {
> > +			/*
> > +			* LSPCON init faied, but DP init was success, so lets try to
> > +			* drive as DP++ port.
> > +			*/
> > +			DRM_ERROR("LSPCON init failed on port %c\n",
> > +				port_name(port));
> > +		}
> > +	}
> > +
> >   	return;
> >
> >   err:
> > diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> > index fa77886..402e656 100644
> > --- a/drivers/gpu/drm/i915/intel_drv.h
> > +++ b/drivers/gpu/drm/i915/intel_drv.h
> > @@ -1454,6 +1454,10 @@ bool intel_hdmi_compute_config(struct intel_encoder *encoder,
> >   void intel_dp_dual_mode_set_tmds_output(struct intel_hdmi *hdmi, bool enable);
> >   enum drm_connector_status
> >   intel_hdmi_detect(struct drm_connector *connector, bool force);
> > +int intel_hdmi_init_minimum(struct intel_digital_port *intel_dig_port,
> > +			       struct intel_connector *intel_connector);
> > +
> > +
> >
> >   /* intel_lvds.c */
> >   void intel_lvds_init(struct drm_device *dev);
> > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> > index 79184e2..54b0b46 100644
> > --- a/drivers/gpu/drm/i915/intel_hdmi.c
> > +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> > @@ -1931,6 +1931,23 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
> >   	}
> >   }
> >
> > +int intel_hdmi_init_minimum(struct intel_digital_port *intel_dig_port,
> > +			       struct intel_connector *intel_connector)
> > +{
> > +	struct intel_hdmi *intel_hdmi = &intel_dig_port->hdmi;
> > +
> > +	if (WARN(intel_dig_port->max_lanes < 4,
> > +		"Not enough lanes (%d) for HDMI on port %c\n",
> > +		intel_dig_port->max_lanes, port_name(intel_dig_port->port)))
> > +		return -EINVAL;
> > +
> > +	intel_hdmi->write_infoframe = hsw_write_infoframe;
> > +	intel_hdmi->set_infoframes = hsw_set_infoframes;
> > +	intel_hdmi->infoframe_enabled = hsw_infoframe_enabled;
> > +	intel_hdmi->attached_connector = intel_connector;
> > +	return 0;
> > +}
>
> Hmm. I think I had patches somewhere to isolate the infoframe stuff from
> the HDMI code a bit better. I think I even had patches to move the
> infoframe hooks to the dig_port level. Should maybe dig those up.
Sure, that will be more systematic, and a better design.
> > +
> >   void intel_hdmi_init(struct drm_device *dev,
> >   		     i915_reg_t hdmi_reg, enum port port)
> >   {
> > --
> > 1.9.1
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